| 摘要 |
An electromagnetic actuator has a motor that indexes an armature element repeatedly by one step from a rest position, and has an electromagnetic clutch coupled with the armature element to increment an optical element that controls light according to relative position. In adjustable polarizing sunglasses, the actuator incrementally rotates a polarized element in each lens in response to the brightness which a sensor receives through the sunglasses. An electrical control circuit compares, in each operating cycle, the sensor signal with high and low reference values to select the motor drive signal.
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